diff --git a/test_conformance/conversions/CMakeLists.txt b/test_conformance/conversions/CMakeLists.txt
index 32990eba..e2e97667 100644
--- a/test_conformance/conversions/CMakeLists.txt
+++ b/test_conformance/conversions/CMakeLists.txt
@@ -1,9 +1,5 @@
 set(MODULE_NAME CONVERSIONS)
 
-if(CMAKE_COMPILER_IS_GNUCC OR "${CMAKE_CXX_COMPILER_ID}" MATCHES "(Apple)?Clang")
-    add_cxx_flag_if_supported(-Wno-narrowing)
-endif()
-
 set (${MODULE_NAME}_SOURCES
       Sleep.cpp test_conversions.cpp basic_test_conversions.cpp
 )